feat: improve templates of features to allow better testing of routing related stuff

[jtdLab]

Currently the routing tests are based on calls to a mock NavigatorObserver beeing verified.
This is not perfect because the navigator only gets notfied when the routing action completes.

A better approach would be to provide a hybrid mock router which has alls neccessary routes setup to run test but allows methods like push pop replace etc beeing verifeid